I am trying to find out how reliable is the M3i Zero Flash Card also has any body found or suspected that there M3I Zero card is killing their memory card as I think it's killing mine
m3i0 usually doesn't kill microSD's.
my only experience with an M3 ever "damaging" anything is with DSorganize editing a file, in which case the filesystem got damaged.
never had an issue with mine it has a couple of plus points ...
1) Up-datable without the need of a second DS (you just add the update to your micro sd and connect the USB UPDATER cable and connect to your usb port and it updates the card)
2) Using the 9tails loader from here you have loaders for just about every game card out there so compatibility isn't an issue with the majority of games
It doesn't damage your card or anything, at least mine never did, but I would suggest to please go with a better card like an Acekard 2i or a Supercard Two